Fatal error: Uncaught Error: Class 'PhpOffice\PhpSpreadsheet\Writer\Html' not found in /opt/lampp/htdocs/kuesioner/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Pdf.php:11 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/kuesioner/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Pdf.php on line 11